You’re right that you cannot pay a dividend but you missed the check on your knowledge of how wealth and money work: that money doesn’t exist. Only a miniscule fraction of that wealth exists as a budget you can just spend as you know it. All that those billionaires have is the ability to tell people what to do and all they can spend is reallocating productivity towards other goals. All the money that actually gets spent goes into other people’s pockets and gets spent in turn. The inefficiently in this system is far lower than the inefficiency in a planned economy.